William Gunnell House, also known as Gunnell's Run, is a historic home located in Great Falls, Fairfax County, Virginia. It consists of a frame dwelling built in two stages and dated to about 1750, together with its compatible and unobtrusive 20th-century additions. The earliest section is a 1 1/2-story frame Colonial-era dwelling with irregular bays and three entrances. It was carefully restored and rehabilitated in the preservation manner of the Colonial Revival style after 1933. Also on the property are a contributing log house (c. 1770) outbuilding and two early wells.